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Synthesis and characterization of enhanced visible light-driven mesoporous TiO2-WO3/Bi2WO6 nanosheet photocatalyst

Ma C. Y.,Wang R. T.,Zhao G. H.,Zhang Q. Y.

The construction of matchable multi-heterojunction with appropriate morphology provides a good strategy for improving the performance of semiconductor photocatalyst in degrading organic pollutants. Herein, binary WO 3 /Bi 2 WO 6 nanosheets coupled with various contents of mesoporous anatase TiO 2 nanoparticles for constructing TiO 2 /WO 3 /Bi 2 WO 6 heterojunction composite photocatalysts are hydrothermally fabricated. The investigation on structure and properties in the TiO 2 /WO 3 /Bi 2 WO 6 ternary photocatalysts in terms of the incorporation of TiO 2 is systematically conducted by using characterization techniques. The results show that the TiO 2 /WO 3 /Bi 2 WO 6 ternary composite at the optimized Ti/W ratio of 1:2 has the highest visible light-irradiated MB degradation, which is 9.5 times and 2.8 times that of pure TiO 2 and pristine WO 3 /Bi 2 WO 6 nanosheets, respectively. The effective charge separation between TiO 2 and WO 3 /Bi 2 WO 6 has been confirmed by PL and current–voltage (I-V) characteristics. A possible mechanism is clarified through the active species trapping experiments using various scavengers, indicating that photogenerated holes and • OH radicals play a key role. The enhanced photocatalytic activity can be ascribed to the synergistic effect of the unique structure with some favorable properties, including the elevation of the separation efficiency of photoinduced electron–hole pairs at the multi-heterojunction interfaces with appropriate band structures as well as more active adsorption sites of mesoporous/nanosheet microstructure in the degradation process. This research may provide a simple method for design and preparation of novel heterojunction photocatalysts for enhanced visible light-driven photocatalytic activity. Graphical Abstract